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WO2017156129A1 - Garniture de puits de forage et son procédé de fabrication - Google Patents

Garniture de puits de forage et son procédé de fabrication Download PDF

Info

Publication number
WO2017156129A1
WO2017156129A1 PCT/US2017/021364 US2017021364W WO2017156129A1 WO 2017156129 A1 WO2017156129 A1 WO 2017156129A1 US 2017021364 W US2017021364 W US 2017021364W WO 2017156129 A1 WO2017156129 A1 WO 2017156129A1
Authority
WO
WIPO (PCT)
Prior art keywords
swellable
base pipe
pair
packer
rings
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US2017/021364
Other languages
English (en)
Inventor
Steve GLIDEWELL
James Miller
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Elite Elastomers Inc
Original Assignee
Elite Elastomers Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Elite Elastomers Inc filed Critical Elite Elastomers Inc
Publication of WO2017156129A1 publication Critical patent/WO2017156129A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B33/00—Sealing or packing boreholes or wells
    • E21B33/10—Sealing or packing boreholes or wells in the borehole
    • E21B33/12—Packers; Plugs
    • E21B33/1208—Packers; Plugs characterised by the construction of the sealing or packing means

Definitions

  • the present invention relates generally to wellbore packers for oil wells. More specifically, this invention pertains to a wellbore packer that has improved swelling characteristics and a method for manufacturing that packer.
  • the present invention relates generally to wellbore packers for oil wells. More specifically, this invention pertains to a wellbore packer that has improved swelling characteristics and a method for manufacturing that packer.
  • Wellbore packers are known in the art. These devices are designed to be inserted into wellbores and to swell when exposed to oil or water to seal off fluids and pressures within the wellbores. Prior art packers, however, do not always swell evenly when exposed to fluids because the ends of the swellable material included in these devices can swell and seal off the rest of the swellable material from the fluids causing the swelling. These prior art devices also do not swell as large as possible because prior art designs allow the swellable materials included in these devices to expand along the length of, rather than perpendicularly outward from, these devices.
  • the swellable material extends into a gap formed between the base pipe and end rings used in these prior art devices and that creates a potential failure point when in use.
  • a new wellbore packer with improved swelling characteristics that addresses these issues.
  • the present invention addresses this need by providing a wellbore packer having improved swelling characteristics in oil and/or water and a design that prevents the swellable material included with the device from expanding along the length of the device and allows the swellable material to swell in a more uniform and complete manner.
  • the wellbore packer includes a base pipe, a pair of end rings connected to opposite ends of the base pipe, a swellable material connected to the base pipe between the pair of end rings, and a pair of non swellable end caps connected to the base pipe and the swellable material between the swellable material and the pair of end rings.
  • the swellable material may be an oil swellable material, a water swellable material, or a hybrid material that swells in oil and water.
  • the pair of non swellable end caps prevent the swellable material from expanding along the length of the packer.
  • the non swellable end caps also prevent the ends of the swellable material from swelling in a manner that prevents the rest of the swellable material from coming in contact with fluid and allows the swellable material to swell in a more uniform and complete manner.
  • An exemplary embodiment of a method of making a wellbore packer of the present invention includes the steps of providing the base pipe; applying a layer of swellable material to the base pipe; connecting a pair of curing rings to opposite ends of the base pipe; connecting a pair of non swellable end caps to the base pipe in between the swellable material and the curing rings; co-vulcanizing the swellable material and non swellable end caps so the end caps bond with the swellable material; and replacing the curing rings with end rings.
  • FIG. 1 is a perspective view showing an exemplary embodiment of a wellbore packer of the present invention.
  • FIG. 2 is a side view of another exemplary embodiment of a wellbore packer of the present invention.
  • FIG. 3 is a perspective view showing a sandblasted pipe used in one embodiment of the present invention.
  • Fig. 4 is a perspective view showing primer added to the pipe shown in Fig. 3.
  • Fig. 5 is a perspective view showing bonding agent added to the primer and pipe shown in Fig. 4.
  • Fig. 6 is a perspective view showing the base pipe, swellable material, non swellable end caps, and curing rings used with one embodiment of the present invention.
  • Fig. 7 is enlarged perspective view showing one end of the packer shown in Fig. 6.
  • Fig. 8 is a perspective view showing one embodiment of the non swellable end caps used with the present invention.
  • Fig. 9 is a perspective view showing the assembly from Fig. 6 wrapped in nylon prior to curing.
  • Fig. 10 is a perspective view showing one embodiment of end rings used with the present invention.
  • Figs. 1 and 2 show exemplary embodiments of a wellbore packer 10 of the present invention.
  • the packer 10 includes a base pipe 12, a pair of end rings 14 connected to opposite end portions of the base pipe 12, swellable material 16 (or swellable element 16) connected to the base pipe 12 intermediate the pair of end rings 14, and a pair of non swellable end caps 18 connected to the base pipe 12 intermediate the swellable material 16 and the end rings 16.
  • the non-swellable end caps 18 act as stops at the ends of the swellable material 16 and prevent well fluids from flowing in between the swellable material 16 and the base pipe 12 and causing a failure.
  • end caps 18 Because of the non-swellable nature of the end caps 18, they also act like an anchor on the ends of the swellable material 16 (once they are co-vulcanized and cross-linked to that material) and limit the amount of swell that can occur in these areas. This, in turn, allows well fluids to reach the center of the swellable material 16 and cause it to swell more uniformly and completely.
  • the swellable material 16 may be rubber and may be bonded to the base pipe 12.
  • the non swellable end caps 18 may be bonded to each end of the swellable material 16 and may also be bonded to the base pipe 12.
  • the base pipe 12 may include threaded portions 20 (Fig. 2) located on opposite ends of the base pipe 12.
  • Swellable material 16 may be an oil or water swellable material, such as FSC- 06 or FSC-1 1 , both manufactured and sold by Tarn International, Inc., or may be a material that swells in both oil and water.
  • the end rings 14 may be connected to the base pipe 12 using set screws.
  • Non-swellable end caps 18 may be manufactured out of any non swellable material that does not swell in the presence of oil and/or water.
  • the non-swellable end caps 18 are manufactured out of a novel rubber compound that will co-vulcanize with (or cross-link to) swellable compounds.
  • the compound includes a base polymer mixed with various optimized amounts of other components described in detail below.
  • the "base" polymer may be a polychloroprene rubber (CR) and/or any other polymer that can be compounded in such a way to co-vulcanize with a swellable material.
  • the compound may also include fillers, activators, antioxidants, process aids, plasticizers and curatives.
  • Suitable fillers include, but are not necessarily limited to, carbon black, silica, clays, calcium carbonate, bentonite and the like, and combinations thereof.
  • the proportion of filler may range between 25 and 60 PHR (parts per hundred rubber).
  • Suitable activators include, but are not necessarily limited to, magnesium oxide (MgO), zinc oxide (ZnO), zinc stearate, stearic acid and the like and combinations thereof.
  • the proportion of activator may be in the range of 1 -10 PHR.
  • Suitable antioxidants include, but are not necessarily limited to, any of the diphenylamines (e.g. Naugard antioxidants) or any of the mecaptobenzimidazoles (e.g. Vanox ZMTI from R.T. Vanderbilt Company) and the like and combinations thereof.
  • Suitable process aids include, but are not necessarily limited to waxes (e.g. Vanfre waxes from R.T. Vanderbilt Company), or process aids such as WB-16 and HPS-1 1 from Struktol and the like and combinations thereof.
  • the process aids and the antioxidants may each be in the range of .5 to 5 PHR.
  • Suitable plasticizers may come from the naphthenic process oil family, paraffinic process oil family, Oleate or Ester family of plasticizers. The proportion of plasticizer may range from 2 to 25 PHR.
  • Suitable curatives or curing agents may include, but are not necessarily limited to sulfur, peroxide and their co-agents (such as Vulcup 40 KE and triallyl isocyanurate (TAIC)) and the like and accelerators.
  • Suitable sulfur accelerators include, but are not necessarily limited to, mercapto compounds, sulfonamides, thiurams, guanadines and the like and combinations therof.
  • Non-limiting examples of more specific mercapto accelerators include 2-mercaptbenzothiazole (MBT), mercaptobenzothiazyl disulfide (MBTS), sulfonamides usch as benzothiayl-2-t-butyl sulfonamide (TBBS), thuirams such as tetramethyl thiuram di sulfide (TMTD), guanadines such as diphenyl guanidine (DPG) and combinations thereof.
  • Suitable curatives and accelerators may be each present in the range from .2 to 3 PHR except in the case of polychloroprene where zinc oxide can be considered a curing agent and may range from 2 to 7 PHR.
  • the base pipe 12 may be a Grade P1 10 oil well drilling casing pipe having an outer diameter of 4.5 inches and a length of 14 feet
  • the swellable element 16 may have a length of 72 inches (may be 5 feet or 60 inches in other embodiments) and a thickness of 1 .125 inches (causing the resulting outer diameter of the base pipe 12 and the swellable element 16 to be 5.625 inches)
  • the end rings 14 may be manufactured out of metal and have an outer diameter of 5.75 inches.
  • the end caps 18 may be annular in shape (O-ring shaped) with a gap 22 (which allows easy connection to the base pipe 12 by twisting the end caps until the gap is wide enough to slip over the base pipe and then slipping the end caps over the base pipe), and substantially flat having a thickness of 1 /4 inch (the thickness may vary from one embodiment to another), an inner diameter of 4.5 inches, and an outer diameter of 5.75 inches.
  • the finished packer 10 may have an outer diameter ranging from 5.690 inches to 5.720 inches. All dimensions are approximate and can vary from one embodiment to another.
  • an exemplary method for making the packer 10 shown in Fig. 1 includes the steps of: providing the base pipe 12; sandblasting (with sand, metal shot, or another suitable sandblasting material; sandblasted pipe is shown in Fig. 3) the base pipe 12 so it has a surface suitable for receiving a primer; cleaning the pipe with isopropyl alcohol and allowing it to dry; applying a layer of primer 24 (Fig. 4) to the base pipe 12 (by hand painting in one embodiment, although it could be sprayed on or applied with other methods in other embodiments); allowing the pipe to dry for 30 minutes or until the primer is dry; applying a layer of bonding agent 26 (or adhesive 26; Fig.
  • Non swellable end caps 18 prevent swellable element 16 from swelling along the length of base pipe 12 and into gaps between the curing rings 28 and the base pipe 12. They also prevent the ends of the swellable element 16 from swelling (to some extent anchoring the ends of the swellable element 16) and preventing fluid from reaching the rest of the swellable element 16 so the swellable element 16 swells in a more uniform and complete manner.
  • Primer 24 may be Chemlok 205 primer and bonding agent 26 may be Chemlok 236A adhesive, both of which are manufacturing by Lord Corporation.
  • the curing rings 28 may be connected to the base pipe using set screws.
  • the packer 10 may be cured in an autoclave for 4 hours at 300 degrees Fahrenheit. After that time, the autoclave is allowed to depressurize (the autoclave may be pressurized and the pressure can vary from one embodiment to another; in one embodiment, the pressure is 70 psi and in another the pressure ranges from 60-85 psi), the packer is removed and allowed to cool, and the nylon is unwrapped from the packer.
  • the curing process including the time, duration, and pressure, may vary from one embodiment to another.
  • end rings 14 have cylindrical main bodies 13, beveled sides (or ends) 15, which facilitate insertion into boreholes, substantially flat sides 1 1 opposite the beveled sides 15, and threaded set screw openings 17 (mounting openings 17) disposed in the end rings 14 in an alternating pattern to create a more stable connection to the base pipe 12.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Pipe Accessories (AREA)

Abstract

L'invention concerne une garniture de puits de forage 10 qui comprend un tuyau de base 12, une paire de bagues d'extrémité 14, un matériau gonflable 16 relié au tuyau de base 12 entre la paire de bagues d'extrémité 14, et des capuchons d'extrémité non gonflables 18 reliés au matériau gonflable 16, et le tuyau de base 12 entre le matériau gonflable 16 et la paire de bagues d'extrémité 14. Un procédé de fabrication de garniture 10 comprend les étapes consistant à utiliser un tuyau de base 12, à appliquer un matériau gonflable 16 sur le tuyau de base 12, à relier des bagues de durcissement 28 au tuyau de base 12 ; à relier des capuchons d'extrémité non gonflables 18 au tuyau de base 12 entre le matériau gonflable 16 et les bagues de durcissement 28 ; à vulcaniser simultanément le matériau gonflable 16 et les capuchons d'extrémité non gonflables 18 jusqu'à ce qu'ils se lient les uns aux autres ; à retirer les bagues de durcissement 28 ; à relier des bagues d'extrémité 14 au tuyau de base 12 adjacent aux capuchons d'extrémité non gonflables 18.
PCT/US2017/021364 2016-03-08 2017-03-08 Garniture de puits de forage et son procédé de fabrication Ceased WO2017156129A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201615063823A 2016-03-08 2016-03-08
US15/063,823 2016-03-08

Publications (1)

Publication Number Publication Date
WO2017156129A1 true WO2017156129A1 (fr) 2017-09-14

Family

ID=59789719

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2017/021364 Ceased WO2017156129A1 (fr) 2016-03-08 2017-03-08 Garniture de puits de forage et son procédé de fabrication

Country Status (1)

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WO (1) WO2017156129A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120018143A1 (en) * 2010-07-23 2012-01-26 Weatherford/Lamb, Inc. Swellable Packer Anchors
US20130277069A1 (en) * 2009-05-01 2013-10-24 Swelltec Limited Swellable Downhole Apparatus and Support Assembly
US20140034334A1 (en) * 2009-06-30 2014-02-06 Antelope Oil Tool & Mfg. Co., Llc Interference-fit stop collar and method of positioning a device on a tubular
US20150008646A1 (en) * 2010-03-11 2015-01-08 Tendeka B.V. Seal assembly and method of forming a seal assembly
US9267352B1 (en) * 2012-09-12 2016-02-23 Alaskan Energy Resources, Inc. Swell packer with end rings and cutters

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130277069A1 (en) * 2009-05-01 2013-10-24 Swelltec Limited Swellable Downhole Apparatus and Support Assembly
US20140034334A1 (en) * 2009-06-30 2014-02-06 Antelope Oil Tool & Mfg. Co., Llc Interference-fit stop collar and method of positioning a device on a tubular
US20150008646A1 (en) * 2010-03-11 2015-01-08 Tendeka B.V. Seal assembly and method of forming a seal assembly
US20120018143A1 (en) * 2010-07-23 2012-01-26 Weatherford/Lamb, Inc. Swellable Packer Anchors
US9267352B1 (en) * 2012-09-12 2016-02-23 Alaskan Energy Resources, Inc. Swell packer with end rings and cutters

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